Also want to add to previous message.  Changed rsync port to 873 by
default in test according to /etc/services and rsync service default
port in Guix in this patch.  And cleaned up little bit.

--8<---------------cut here---------------start------------->8---
-(define* (run-rsync-test rsync-os #:optional (rsync-port 581))
+(define* (run-rsync-test rsync-os #:optional (rsync-port 873))

-(define* (%rsync-os #:optional (rsync-port 581))
-  "Return operating system under test."
+(define* %rsync-os
+  ;; Return operating system under test.

-          (service rsync-service-type
-                   (rsync-configuration
-                    (port-number rsync-port))))))
+          (service rsync-service-type))))

    (description "Connect to a running RSYNC server.")
-   (value (run-rsync-test (%rsync-os)))))
--8<---------------cut here---------------end--------------->8---